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HEEGAARD GRADIENT OF SEIFERT FIBERED 3-MANIFOLDS
Published online by Cambridge University Press: 14 June 2004
Abstract
The infimal Heegaard gradient of a 3-manifold was defined and studied by Marc Lackenby in an approach towards proving the well-known virtually Haken conjecture. As instructive examples, Seifert fibered 3-manifolds are considered in this paper. The author shows that a compact orientable Seifert fibered 3-manifold has zero infimal Heegaard gradient if and only if it virtually fibers over either the circle or a surface other than the 2-sphere or, equivalently, if it has infinite fundamental group.
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- © The London Mathematical Society 2004
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